Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba1f746955977a3…

MALICIOUS

PDF

67.6 KB Created: 2020-11-20 04:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ac33773e5c2a726fbb001d74f13bce30 SHA-1: e9d908cadde871c8d917a97a5981fedb26d1167a SHA-256: 8ba1f746955977a346d33c009eac6bcf690a97725eaf9d3ea90ce0ac9432b1d5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with 26 external PDF links, many of which are SEO-redirectors. The primary malicious URL identified is https://traffnew.ru/123?utm_term=honda+mb5+for+sale, which is presented as a lure for a free download. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffnew.ru/123?utm_term=honda+mb5+for+sale PDF link annotation
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/tuwafebotaxowude.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/kitunox-lomulezomeroxin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/memul/princess_diana_biography.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/cos_my_banner_web_login.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/83672531919.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/buy_co_ed_confidential_dvd.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/physics_book_for_neet.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/55380175036.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/tezikut.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/classification_of_carbohydrates_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/57932935619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41510b1e-7f01-49de-808a-e1e16727911d/66102226708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a223579-b4db-4080-84b1-c97639aaea12/doppler_broadening_of_spectral_lines.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA6 5276 bytes
SHA-256: 8974a97600cad65469893a268e1c409c3fb80bbbda13f12286e07ad0a1c3329a
font_01_sfnt_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 10728 bytes
SHA-256: 86bad9f22ab854d63747e33b989a3958a7fbcb3e20937b0aea2c0b90afa62b33